Olmiite from N'Chwaning II Mine, N'Chwaning Mines, Northern Cape, South Africa - image 1
Olmiite from N'Chwaning II Mine, N'Chwaning Mines, Northern Cape, South Africa - image 2

Olmiite from N'Chwaning II Mine, N'Chwaning Mines, Northern Cape, South Africa

$120.00

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Good combination piece with rich silky white needlelike crystals of bultfonteinite to 0.4 cm in size throughout this matrix with brownish lustrous prismatic crystals of olmiite. In good condition.The N'Chwaning Mines, situated in the Kalahari Manganese Field of the Northern Cape Province of South Africa, comprise an active underground mining complex operated by Assmang. The deposit was discovered in 1940, and operations were established in phases with the commissioning of N'Chwaning 1 in 1972, N'Chwaning 2 in 1981, and N'Chwaning 3 in 2001, remaining fully active today. Geologically, the deposit is hosted within the Palaeoproterozoic Hotazel Formation of the Transvaal Supergroup, consisting of sedimentary banded iron formations interbedded with massive manganese ore layers. The complex structures feature intense faulting and post-depositional hydrothermal alteration, which have localized rare mineral assemblages including exceptional rhodochrosite, manganite, and gem-quality sugilite.

Product details

SpeciesOlmiite
SizeSmall Cabinet
Dimensions8.0 x 6.5 x 4.0 cm
Listed on10/15/2026
LocalitySouth Africa, Northern Cape, N'Chwaning II Mine
SKU2354041
Current owner
WM
Weinrich MineralsFeatured
3,388 for sale·9 sold

Learn more

Olmiite
Mineral guide
Learn about Olmiite
from South Africa’s Kalahari Manganese Field is a manganese silicate prized for warm apricot hues, ember glow, and radial clusters on dark matrix.
Olmiite
Regional guide
Olmiite from N'Chwaning II Mine, South Africa
orange-pink radial clusters from N'Chwaning II, the type locality manganese silicate prized for color, architecture, and cabinet-worthy specimens.
Locality guide
N'Chwaning II Mine
N'Chwaning II Mine, South Africa — premier manganese locality yielding rare cabinet-scale minerals (hausmannite, rhodochrosite, ettringite) prized for color an…